Spiritual development occupies a structurally pivotal position within the depth-psychological corpus, serving simultaneously as an endpoint of aspiration, a stage-theoretical framework, and a site of pathological risk. The literature divides roughly into three positions. First, evolutionary-integrative thinkers such as Sri Aurobindo frame spiritual development as Nature’s supreme movement: the transmutation of the mental into the spiritual being through religion, occultism, spiritual thought, and direct inner realization, with the individual as the irreplaceable vanguard of collective progress. Second, transpersonal-psychological voices — principally Welwood — insist that realization and actualization are distinct achievements, and that genuine spiritual development for Westerners requires the additional labor of individuation: grounding transcendent insight in a mature personal and interpersonal life. Third, psychospiritual-clinical writers such as Mathieu, drawing on Assagioli, Fowler, and Peck, attend to the shadow side of the developmental arc, mapping how each stage generates characteristic defenses — above all, spiritual bypass — that can masquerade as advancement. Across these positions, recurrent tensions emerge: between realization and integration, between Eastern models that subordinate individuation to liberation and Western models that demand both, and between spiritual development as organic unfolding and as a process that ‘obliges us to leave our comfort zone’ and face the impact of the Self. The term is thus never merely descriptive; it is always contested and contextually freighted.